Found this info for you:
Microsoft Windows XP Media Center Edition 2005 lets you do everything other Windows XP PCs do�and a whole lot more. Browse the Web, play your favorite PC games, e-mail and instant message your friends, and install and use programs designed for Windows XP. Media Center also delivers a powerful yet familiar way to enjoy all of your digital entertainment�photos, music, TV, movies, home videos, radio, and a world of applications and services whether you're sitting in front of your Windows desktop or across the room with a remote control. Media Center is your all-in-one PC and home entertainment center.
From here:
http://www.microsoft.com/windowsxp/mediacenter /evaluation/features.mspx